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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8890b529608ad38fa9e88f631025ce97493cb0049a38fa1c3ecd56bedc947622' 
  AND token = 'zyBJ5jG3WtCipCccfv/MsJHLwl5Oy3QA7KjPex3Kfak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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