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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ea40e18b99481970597cfe35bcc47bb8a63f7f97c0cb049a687d7d6185428b' 
  AND token = 'e++R6qgTu3gEhf68LRXBKyLxR46hTfXzitScg1bvq2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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