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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3921fa1c472959b8cb049414e777873438697389f638123535e8fc36d0caa339' 
  AND token = 'FJ76m7pMa4dgiEJYv4NDoDLAR1AFQJP8uTJwGfF41HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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