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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f3a57a120cf7356ba4c7584c25ac7cc9bb030e94aad4805aff6f741416a3ed' 
  AND token = 'bdF0K22sfZcVBpcO6Z1ZdCH8Rz3jLGw0JpQjDMTwAZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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