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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbabca798d63045784ea3f2e92909095d5d582417088e05462dc604812c77235' 
  AND token = '+glCzrxzi4SW9Hm5Q5DgFLHDhsal/EdUPA3IeNfZ5F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}