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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1ffd92d7835a49ce958feb572b7112b023e02fcab4b7754d78ff0de573c83c' 
  AND token = 'FHgWk48LoSB8+8RTZUS2SGuPreXcQ1hsl+euE6FjP+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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