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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ebdea9b13fb875dc3a945df8995ca23ba76ad7a836ca8104cdc0452d7b82b8' 
  AND token = '5cTGxl6jQid8z9UxrulvVyLx9Po3qEv+eW92WXyqRhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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