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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c627019fb22106988bd02f8c544c1c3e0667cb910e58ca478134fa644700ee82' 
  AND token = 'wa4DST6gq80j5EaS2FxqppUfSXqT/9Sqh9cZZz3I4Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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