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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6666fd51bd925433050f2f6e6b55912647c0e30da1037398d0d8d9bb623c3d9' 
  AND token = 'VTs7wctPaacj59LrmhkwKWqnfmoeBzEG2oeaxWwd/U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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