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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa17347ba7de0b5929aa7974b87181f02bec545778e5124412e310f9fb6eb18' 
  AND token = 'PsPamRu8VFqhei6CTXX6m6m1bHqwUY4hbWCe1u3SYwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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