SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336700ddd29524ddd13644324b8eea9813151efc9058532093b84c196c67ec01' 
  AND token = '7B0+h/AwqwdzY7m9ZUIWJOEuIKga7Tu6cX3/ryKHe7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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