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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2417627fe3fa72b0ca4e3f2e003b8c41a907360d3805b558f011dcb663beb01f' 
  AND token = 'bz9Ud7ojMjfH2WQrK8ZIy82jiNpnM2aQgjNdb9R2GMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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