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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efafcc77d114c573b6d572f76f6c5bb17ef81b8f8a0bf728d7c78624a74e081c' 
  AND token = '76mN5x6Mf2RAD2Ps4kbP16G0gS1kEBypxd/iiLM1cWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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