SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09943c6058b6bf4d20e85a3e6efb33f9cf4b17c712625962f86d638b8b0ae0c1' 
  AND token = 'TBL/w5w12sueZJZuPGOAaiPEjdqxHue1yYKJUfbg2rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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