SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72c495c0c0d9f770a8b1976c1ba114478fdb0d82236ed346a5ac5b98b4af7f5' 
  AND token = 'no+0tMGh/weBhr1Q6h97D2uUaVuWvoZUp8K4d2X/3YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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