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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b29d99d6625a3187ff5f17d3179a2308fb688108c88c80dae73ee378c5bad5' 
  AND token = 'o91fiMrWd9/RsqC8ofxHWej/Imh5hEs7jjKTvmOXLv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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