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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb7cd5fc73adb2e2e58fd1acf9aa45726149c58bd638e90ca5304a3725d42e5' 
  AND token = 'A1dfSvPSwKCxb2YamapeeTAfaKd08y5Z8gHu4z8cAgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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