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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefd719220ef9968c4e28f5fdb11e897d4f9d5548791ac9bf17f231f8040c2b3' 
  AND token = '+F2YWMCiIU81timf4QTG19fjWk1UPswLmEY3pF9cpJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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