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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269d0407312c7c6be0569820517c2a8b56e36699bb341dcab2844f82ba5130a3' 
  AND token = 'y20DVo/XXUPE3FCihZmKl8qF3V99FK1w1CF+HLS7tOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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