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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9847a445dd8082dd20f0eb7ed28680f380c36826be0dbf8248c34b9f597eb6ef' 
  AND token = '9hCnOUeba4aIRLcdJsOCSv9jgdBX4PjnhmjbyNfCslo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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