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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f2065b9ea3bdaec3e1cc79f5ba75976f65ee4d9043b938d26c0c5be94f8ef2' 
  AND token = 'G7lIxkGHGnQ3SuHeyknVCh2MCKF2wurGaDuPiCV7fe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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