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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc987b2ad3ea423b4293d862fd49f768ac4f39ba9f5b1cf1c4a56c28d269d31' 
  AND token = 'WVKdCJArrxu28gMwDy2eFtUI6NEyITbT82vlFCzYOoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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