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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b840d18e784ee29c441302036957fe00a654f8894787cc04fe086e7e207d519' 
  AND token = 'H336vpPxW1L6HHMc3xSy/l7HUuf7iKqx/kw/QBRGQeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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