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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce944c8a9322b8600c2bc1d769c849d3ec57952dc5ac7a30902f4066e9ca29f' 
  AND token = 'U04Cr853lkZBUXsZMGglyArHZMG5YxCx6LU6wMrvm7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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