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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c81bce7e266b76f1407dbb468f1187734f0c58041cd0f12429c710c3584908' 
  AND token = 'hzjhrjvrXx7+iTM1a0KA0n1VSe5IbquKWuYBKvBPexU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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