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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03c3487635e7697fdf71f21f2ddb94d1cc7d7a29d1e5b768e88ece5b919e8a2' 
  AND token = 'OhAjs4Dr4ESNENo6QDKRiK5tHvSyNuUNRJUSW+VFfiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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