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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075dfdf9bf3a7b7cad5dfebbd4d584630304ef9e3cb899af91d2ae365a8cc3f7' 
  AND token = '7ge1ECTrnikJfDghNXSsIf4MyP0Y/fn7Pl1zSZXSzgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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