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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ebf0402c02a1271879ddd23c515448ad042757ff8c182f22ab5886145b2088' 
  AND token = 'idH4p/7pcPs4F9SmofAPWx0/2SSGbEMnFKT06Mn6GiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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