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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565ececedeeb2d0639e7dafef18591cb606d341d841b2426809923a5ba1c3d31' 
  AND token = 'dSFxt8R15H5datvze7cgnTsdDNol0941m5UjEDA6qQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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