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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aae4bc58c570f1a256bf22b4e9181a43c58eb407e82b5b9cbaf71a78b73df44' 
  AND token = 'fn6ErG8OtA4SY76gqf62d/VkaUaMkUB6jNWonJY06jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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