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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238da6dbd29a0a3f178f7da7636debe8dee52b5ece7491bafeed25c660aa9661' 
  AND token = 'SIAnUkoqEtVXbjT5FUXlJqF3KPZrH38kmGG2CWzGRG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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