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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284a8826c6fa9611aa134fab3da28340c35358a435b9592ca3a4427688e6e147' 
  AND token = 'k3pvSn0dsvJOceyf7o8DXoWULUATMHYPOHAQ0NuNhZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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