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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfb684e0c3b2025f5b481b654b3022b3b558a74f806cd8336f527483fbc30a9' 
  AND token = '15jHqKoUkC8z6IqbwfD/GHFb82Z1LF3/cCC0wuohBQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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