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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a58f839555773cad301cb925330dc1eac64caa6003907e19559a64a3a1ceba' 
  AND token = 'SO9ck6DTkiPXTJmZeAB67WL1atoRB2phHqdPh02zCrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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