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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef036f3f5ef4254fef94cdba0e74d808d73ed37d1e7aebbf4f2f12de97d57679' 
  AND token = 'kyaUb5apWhCC0H2FPUGnTQS3Ua5Z1WQ1edphoSAsV5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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