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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2f457a49e0c7e02becd5c4999b741708f91d48e75b7f12bc9815eef3231367' 
  AND token = '6cnfhr/04Astr4glL3meTDncLplY0KlnUlV84goUsB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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