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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6410a65871bc7591132e7cf76aa3ddb68971fc8436143e40caf1e33111637bf' 
  AND token = 'FefmPRNXePuGOEZGVU5fx0ragn8iHEYvt8v+VtBg9sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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