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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e47f3bb8481df23d2f17d51b799ee220af60e81652c285e917eb79156a8c35' 
  AND token = 'LHd0ssWIjEnl32CvMw89Crverk6olxJQJH+CLnwN5NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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