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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c9778e369098f10bf0fba9d7cc5406ccc8217a720ab572449cc811af9141fd' 
  AND token = '/qdieAT3T/LkdMyzTWSY5oxCw8iCKD7Sqszrza1QGZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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