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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1884abc705a7c6c3cb856ae1429cf44f957ec1b6b9fe116bc05c9daf39a5a5c0' 
  AND token = 'QA9pecIHGT4JEeve5zNTAAjOzcyDM7lj2H/oSMe+/6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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