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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dc251995f55a9c6de254c1033dcf9ceab0194aeec5e8046412514eaa44498e' 
  AND token = 'MIfMAgB9IMrv4OJVHcQsAl+A8eBNcVPZxVOoCd3EBuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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