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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce466dfcb08db57b6e467af99a9e9edd286196085811ae5a50a300fda3b8864' 
  AND token = 'gqJnbtJIZq/OUbBnsqLItbldZPA23kxoSyUY3+Veumg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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