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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f530b59e909eade10021e434315b80fb372c7f2057bea2c2715827844d814c4e' 
  AND token = 'lIGaDC3/4/YSE9ird07BlishMaEaQ9Vcv77HYXttWGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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