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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb1c55cea557578c0531c9749a3e5ef938fc68e057a771c8ea633ff6dec1a82' 
  AND token = 'u9MhRGOD6CTFcQSdFed+TC7063diAuT+i061tSUsG3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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