SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fbc4f85fbe59da962a41398f7023d7ca8d864316978ca9a915954f16010be4' 
  AND token = 'ynmGgKQvPa1+byFV9GMvw88YpLYDUHPoF98px6pMiQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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