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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1291bce5430e27a273952b91ccbda06af2721ba573b8cf57fadaab95afc4033d' 
  AND token = '99UtTHcsikzC9e3SCwj9ub9KtNHXpsHyTZ+ung81FRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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