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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd577b7df7394916bb10b892d1f2d3c498dd56c85d9789b06a3bc06995c97212f' 
  AND token = 'xdEBpnPellgjlFvs5aTfQK6cYiSgLMEm37dBZj0dmTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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