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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3593094514d9a2929d06ed4c0c0752fc8227a50333329027f2cfd1fff37a81eb' 
  AND token = 'DRLoLtTz0S8Q8ZGH5gFjKwA1F9Zi7WX+TrEO2RruEa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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