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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f1f7eab842ca2bf185607fdc76fe374f03334e27e0b80856ab8c724e4254af' 
  AND token = 'MWX2aRKla9b8/kkOszy/OwapKZvIjbb1/rl7/qqKVNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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