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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d8de40951047ac2b92bb8d2e33003f678c8c56974a83dd8ce41cd40d330eaf' 
  AND token = 'WbG3gaHxdtBZFRbEpZhzL//Z185rk+T7p6zvegDP4pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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