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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2606354de9dce8bfd698b7533f7e2e36d6226070bbfa387a6e0a64a6fd904166' 
  AND token = '0ml7YPziwdTJcEhrHQ6SgRuEvOBivS/90aj9KlVM2Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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