SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcacddc3424659b96d7c6e851a6f5ce725c7c467b4ab1bb454ea5c90aca9c2d3' 
  AND token = '+FJHVzHBTaqRDROQOW7vkGLDx0Z9zhnrNUS/if2igGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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