SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19029741576a089ffbbddf7ba9c10554f3fd4c35d176e7730003d54822cc4b4' 
  AND token = 'qP+3p/8zmFtLRrrhJOh5Ivw1050dULYr98wHYZEAxeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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