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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81ee771b43f7d5164c18c520e7ef4926a776105c89963c1737a9e1530bff8ec' 
  AND token = 'ZKSQXWvWVrb9GS+rZpo67m97vb/m22nozb7MR8QoVqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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