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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4b1107b77c53955362ff885b4bb8432a4a69c590cb73e977ab7469eeb68eed' 
  AND token = '5V8Jz4QTsmmFmsNHGnNb+pF4QjKms4op0kyuNxP2K3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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