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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8341b1f41d7ca0d21aac610250d2f89ff50a08c67defdaa30614860b1d4d13ff' 
  AND token = 'asVghSlRi/I9nb3vN522vjsX6lHtvOFzC/0ugY/9EnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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