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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d383e3ce8aafee6c06f44f42f2be237e8cecf65c5588f8aa83b7271077b60d' 
  AND token = 'ZIHpzXUvamlIag+5DUpVHp/3YRnInRSDjoRVGdo5azI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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