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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bac24d68f1ac3c7a80a6cf455a25d6a14a742a7368a9ecd7dd3fdcdc252397' 
  AND token = 'ng4Zd6hRtH6y5HX0TNdUC/bpXAwWbij55bAD7qNiLjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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