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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c1157674270958a9665916c4aa8eae07322e49bdc6e61792269e85e3f07b5f' 
  AND token = 'vCH3xLofUfyGHgt8z8WkSzIY2TvFpTbiGTVzJASEPJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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