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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d9f3ba2ad3e6fa0ede19762d6a9a7468c06c999fb18696c5c8967677906e08' 
  AND token = 'nsX6qqAJL6UlIQr+BR1F+UIKpMizz8vBEm8ymi4l/6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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