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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea0b904fed8bdd76754eae7c6ce9227fcbc93d51c71c33809df14d45d30a19c' 
  AND token = '4EcGggJNiQPLY4daHX8WyNv7jqN1//1nZdbpeLMFPpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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