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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b677c66972eb30cda3c91c2d71a4bea6c4686c0299951a5dfee4405c20e0e4a3' 
  AND token = '0GWnE5ZxBUN7szMaFIlKrB7zjn9DOpzmvqGFnJTsq7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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