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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f19df21a116d1b97704716c221e2027f4238f127b687ea98133b7240cdf8bd9' 
  AND token = 'a5ftIRwW2vgi2jlLVHNGtL0A7j22CqQu5enz0vNdg5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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