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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e752e251538e5efe873aefc0f1650e87d2c6a361696ef1b55df9f7210b8edf71' 
  AND token = 'KqDyLajxRx1OMsyizOJb4ni/T16+zL255fRp43p58uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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