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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628c98eb11a8040ab951db290270d2a761b0e39c757ffb56d40aa7583718d32b' 
  AND token = 'kU5wefm/yZ9sSFJznEyT2TRnqhKUzBIK0B7nb9SULYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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